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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b33978402cc97e72ae19856b822a73e0fefeef77891fb1fe5ba9c594b8c608de' 
  AND token = 'Omc8b8aQR3hm92upx/4F+2M1OzZMWJZIROn10yF2TAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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