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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0840a91a5afa42c1c078fb0602b64ec8deab4b06247d5446ad8b3b146c2db18d' 
  AND token = 'KYHIzZppnJNPBPIUSjZ8P1zrvo5S+nt9oKh1L69mDBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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