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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf619c0c20c1af2dceebf492aca81da36be0a2306df4e9faf6b0012c4664cb38' 
  AND token = 'VH4HDLjW9AKnUgHubCG0h6lLwNvCiTvUW3y4mIeR3tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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