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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1d20cb53b7c4a8d26abf47f5d6838ddab6971ce7b4d4d29cd5fd4f3cfd38b8b' 
  AND token = 'hmR5gM9x/V+evbuXaog3POJy2N/1hmT4g6MmMx6d1Ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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