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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0754d20d6310867b0d4faec4f7f6ac2b54af0054979e69ebb96cf64a704bb8ab' 
  AND token = '4nW+0kVmYw+rZ8X6JYTxz4m78CKMvhMwqfXQrWq3D8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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