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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e401388646dbe80964509fb0985c6deb8fb64cad877772777e37fd3229c62c5' 
  AND token = 'eUVWJNWNs3oAm0P1WCtZ3xrWB8ccui08yKbUa9VQa7A=' 
  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"
    }
  }
}