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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d158bd5ac6119785d62d115ed67922f33f8d66b712946f4421cc69634823d76' 
  AND token = '+Wkmq48YjxA3uw1ji+lBolPbNXjJ6JegmMda66RG14Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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