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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b17cd3ef2fb77beb6f0920fd8c4072cfacd28372921395944450ab143007b5d0' 
  AND token = 'Lpy77PE7oXsw9AWgHaMYoAXPTPQNb/dGopWrFk5RXok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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