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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec66ad514051c41f0e572198714319c3caf5bcfda7eb412d05526c6d01fd404c' 
  AND token = 'CzHXHNrFOz/Hc11Q6EaefGt0+LhgwneRQvl9hJ4WM2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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