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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc0343d74298ab87c44b9b24dd0279b7f57f19bafafd8fdd3609641aaeacf3f7' 
  AND token = 'MbbuVjim7/o5gxsWAFvfE7bM/J2/THQsX5UzT2qR2ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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