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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d7a0024e94ceaf58c9e39dd3227409a2ac267dca6bee6058ea623915e4949d7' 
  AND token = 'gpxpjejBaLdZWW7p0cb1p4RxvV28x0op/H0kyzinGzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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