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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f93659e32bb688db9bc3664acbe77062cab5637a2bec6604489ead463f68d3a' 
  AND token = '6ZX5Dkl1+TuR3oCjqniuz8468MjuBaf3LdRxXBOHOcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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