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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6074b8f39f7a16dbcbb6e4094743cee386fa8c7e033049b7d79e894213b96a1a' 
  AND token = 'Kl96hnaa2R/7TAmH0Nydofdg0pXYoNBBVfcLwmxeLHo=' 
  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"
    }
  }
}