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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b19bb9dd6a9f79d12c682ecb86d5cbe0f616d38229ea3f0fa112959c8110bee' 
  AND token = 'm/zxq7jW2NCaEi1eLYHAS0IdJgbM6y9RPVy6UOkGO+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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