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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2dba20c7187aa3cb0adc63cf748a30d2ac24cbf6415f979ff0dd43cf61c28e0' 
  AND token = '1fznIkiMiniRID/UZ0ncP1UsgMAFTrDcVNYmSkxrfXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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