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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8d4285b4db0c0a0f38e91217dfe4b004d420b4b5b6afd40ae70508ae74646ea' 
  AND token = 'tKBIz1yij6djsMIaB91VgJXuqEEL86azFct/+G4KDEE=' 
  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"
    }
  }
}