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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c31b8759d624858805fd1fbc048c92674bfed9acb6a7adae172f646a9a4c3e43' 
  AND token = 'dSvXWfdcK6evWMek0z0/SK1+m83TjQHRkcpW6wx1Nv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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