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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a80c867e158cc249aa30b8d2bff7d792ec6e092129f85d057ef1d2ba3f558f5' 
  AND token = 'eadliEGzzT8m0QRidC0puMyIFDA2dIW5yGphYZNDLRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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