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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab3ec6e39d8f79054ab795858f91a4c794d350c246662f44a69a587f30988bae' 
  AND token = 'PXxlWVXsQ9VGYzNaWoDPXP8P6NeSgc4El2ajrF/Y/d4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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