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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35383767c382c4a083c30a2e49b1bb36ee951025b33895ae82f43db80c41a2db' 
  AND token = '/DilJv+1MVzdmiGUKRg3+QEha3yefCdYFx8nEyrmn2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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