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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3af27d0743f2d0d6f86ed171bb982491268d01ec5f1b48199eefa26e230796e3' 
  AND token = 'G24+ZbWT/MQ/5dvIpxcntuUmfWJdgARYG59T1SKCy4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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