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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eb7b5cfb9630e8b1a19a698bf28f934127dd5100b9c782a5ec344749d72e9ba' 
  AND token = 'vSLob8AVj2+76yM12PcIp+I3iIA1+vmi59Op9eQq1eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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