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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66468a7f979adac819e1c080a2c11cd808e9ad029d1a45c9ae318d87f739dd71' 
  AND token = 'wSlcM0OOdbjIZ/B5l0cvpXhO7pPpRfnXQGHchfqOOsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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