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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17e7fff0008db6540ec802f136f7b8471e1843c163f0a923afd8d13eeaf0b7fa' 
  AND token = '/n2f6+sE/C3Sb0fH34J1TaXAYpATJgbovFoThtO0GW4=' 
  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"
    }
  }
}