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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c068d0def76e7e8d970a5749815375091f95a0d15e4d8da3b58b36c053836353' 
  AND token = 'LprOuwDsjcBBsPLpaHwANkStqM50DDLHmkFJzqAXl1w=' 
  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"
    }
  }
}