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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6071f6de877936d31bca7687cb0a4618b7828b3c84f3e0dde46aeb6c8714f744' 
  AND token = '/gpVhjK7Lx0aHiD5XqPmg6fG0INcs4ysnRXjCGxMHF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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