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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef3783772037d050d81c9a2cffe02d354d413241ce9dc2d785b34f1c741912c8' 
  AND token = 'xl2hmfZwzcNHQ+B07ScJ0RALSVGTs6jmKHSt/8j3USc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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