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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60773f7f39ff07814633f540da63b442b8b8f9da8514b93e443a63a3d734ee4e' 
  AND token = 'Z4WgXs8F4jnIS1nQdwZb4K8p1I9mbqQZaodk5Gy5+dM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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