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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2bfbd6bcba92a53e906ba7c5da98736ea160ef07dd35c87d663f42cd41c1f21' 
  AND token = 'PX++n13EyDcR6jtnF9lBcZ/9UdqubVY15AVLuKyLe04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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