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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55a0f6063bcafa4ffb9bc5fc22f00bda033b0d061ebfe3bd2361f57a69c228a7' 
  AND token = 'IgNHM1tbotkbyLvxW6s31Z69Dgrt5Qn3ECOgUDb6Mjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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