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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aebd9a6c94b2933684117c9a51d07c3684976e5f7ed220203aa049c2924b1a72' 
  AND token = '03gLC8n5voac2t7mmTnPJvZ2G45AkDk2lic7fhfMqbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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