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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b56e00c4b88ce421c6388976a50f55d7b75e84af8ca7e76338a089ce853cd676' 
  AND token = 'jPF3w1gWRdgjs1E7NPMnryjGBdUnO3bVkI14GowwMNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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