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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1abde2eef992f3627488e10637f6de9d7fb3e7db80c34f36145b1db964ec5d61' 
  AND token = 'EUMaVncT5tdRAKjlyVFwHx+2cc4r+JyDuStGr5+5vPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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