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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4228ae945deb47ab52c8917d89fcec0b95c3f8bbb60d708908e0d3fdf7d73eb2' 
  AND token = '50ckc2LnzxCEON6RZxDCW4g6v6v/ykb/8HQbejPHPP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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