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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28945a34f323eb8fb96926f96e0be6e0b63eaea6a1f5fd84305dad6b70304306' 
  AND token = 'tA+3oCKsiu56JJUOD3qbxIGRkCI7rtdBLxI7+3yIQjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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