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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00aa1426f4dc0c1a1f05f31a8ce8510df369d140321ea89532b13e9150e3676c' 
  AND token = 'M/d2IPvWOgs48OrvD0dVB25MEZd79f2dwVomyNIOVBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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