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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29160d64f858c0bda5c88824e596d1d9ca03f2a9d57f8182c1217e47dbff1601' 
  AND token = 'J4X6Zo2tJ1Hqg6uR9t4ybWsAyzToIQ3bnc5uxOgeGAI=' 
  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"
    }
  }
}