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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a37f6c6513b5f2e66258d3ed2345674c7117a67b85a724c8346e33c947b28903' 
  AND token = 'vrLMUHpflPi1KnbL0DgrXyg6y8yBHvW1f89bYpmURWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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