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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2742d004cc3a73e29f386f1f54fdd1afb266249c171d1b27e640b262b3669fad' 
  AND token = 'OEMLnX3wueb4+HMVDGSLx07TYiiVKWdsN2ZsAs4V0Sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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