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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cd61772d1f4b447112e3ee7a12be6579c0b4fa82a9cbb51d95c15a994b2bb0d' 
  AND token = 'N/STiEzWbqSzA0cpfEGWb6haDGJasICeteBYl09fSGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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