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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e53582bc48cf579be2a3c2420b38832ea25d212d7cbd15b09584027b598eeeb' 
  AND token = '0yqletkXyDCYMSqLP7H7d7+axznHPgIan1iA9MIDdB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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