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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c3b2cdc5e0dde0f946100ce8f483847eef11471656b4b39a0bf296a5d6836b0' 
  AND token = '0Ldg0QcTR5TkTo0sDMyt401kIAoZgMoWjPf8Ea0CMYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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