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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f08221fd243710139d772e10e255588ae632f3bb5d64229a5eea6764878ee7e' 
  AND token = '/vqUxk/aKcq9w4WctIdGx4tsh1YPUncGb4mCcBtgKBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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