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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88d5d94bc0fe80f0296749b1b81b43a7ed568e32610ab8bf28abc3713c395af6' 
  AND token = 'EKY5atduWqwtScBRFqYUr0xHyacnikptIv25Uv5NuQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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