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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9925577e35bb07355a7d42f80d4d785f678b1b4714c7e1ec2ab27bb04f7dd01' 
  AND token = 'dAvHQt8Yfp4Eu2LLKI2yLN7JApqBQORk8B4CfSiazC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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