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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e477a523b8e7b3373f839ae09cd9ac3d37aaa23e6049a2ad391045ee4157f26' 
  AND token = 'Pgsd8Nm4roVHmSKFpuq3gvORO/iGCIJrfAAnxH+4wA8=' 
  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"
    }
  }
}