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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19c5e4e977d472484df486c7d05626fc2c27939d97531eac861c48b31289c2a6' 
  AND token = 'O9n9XdQcUbWd0ISgR2wNY+4I74ErsOnaobdpyem3/ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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