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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db7869f645dca90414afb2cd74176f1b4806d5c3dbdc1ad3bbdd5bb3a595527b' 
  AND token = '7VTgqUZKH2Kn8gEpPNbJJucpuxHpqwksS0D1cAVqmoY=' 
  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"
    }
  }
}