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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4145b675f4367bf62c94a6b3778b4165eca3f80ebde98360dec50089be59d6c9' 
  AND token = 'vBjuobGlVXd/0mjp7SeKz9ZpEWsT30FFRjsm4PpTSvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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