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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '192d8ebece326e2e54e036ab0245dff2f241a7d1cc1d4e7fcde12d1708e44cdb' 
  AND token = 'sdqklD6WWV1G3GYqEdGbGtNgtbxqOhnVKSdt/aOmPQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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