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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31c7c774168bff44d6eeb55b285f16d777afb2fde69b97228e46e49ee10f3832' 
  AND token = 'BsVMyGsgUI48JK/4d1oPD0u2cOt9maNgPj82tSjI2n8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}